Building extrusion



FIG. 1 is a front end view of a building extrusion, showing our new design;

FIG. 2 is a back end view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a perspective view thereof.

The building extrusion is shown with a symbolic break in its length. The appearance of any portion of the building extrusion between the break lines forms no part of the claimed design. 

CLAIM The ornamental design for a building extrusion, as shown and described. 